import os


def open_file(n):
    """

    :param n: n is a file name of last.
    :return: a tuple from file, that tuple has two item.
    """
    re = []
    with open(f"1-{n}.txt",mode="r", encoding="gbk") as file:
        ff = file.read().split("\n")
        for f in ff:
            re.append(f.split("\t"))

        return


